Used in peptide synthesis as a protected amino acid building block, particularly in the development of pharmaceuticals and bioactive peptides. The Boc (tert-butoxycarbonyl) group protects the amine functionality, allowing selective reaction at the carboxylic acid site. The aza-amino acid structure introduces a nitrogen atom in place of the alpha-carbon, which can enhance metabolic stability and modify conformational flexibility in peptide chains. Commonly applied in medicinal chemistry for designing enzyme inhibitors and peptidomimetics.